Analyze this Factorio blueprint and generate metadata.

Blueprint:
{{ blueprint | tojson(indent=2) }}

Generate:
1. A concise title (max 10 words) that describes what this blueprint builds
2. A purpose description (1-2 sentences) explaining what it does and how it's used

Format your response as JSON:
```json
{
    "title": "...",
    "purpose": "..."
}
```